i'm looking for advice on a subwoofer to help complete my system . for some reason i'm only looking at two company's don't ask why. Axiom has helped me build my new system with my m60's front speakers (very happy), my soon to arrive vp150 and qs8's, but axiom is not on my list for a sub . my room space is 17x17x14, i live in an apartment building so i don't want my neighbors to be knocking on my door the first day i connect it. svs and velodyne are the names on the list. possibly a low end cylinder sub from svs.not looking to spent more than $700. all this to be run through a soon to be released denon 2807 receiver. help